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computation.h
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1 //
2 // Copyright 2016 Pixar
3 //
4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
6 // compliance with the Apache License and the following modification to it:
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14 // You may obtain a copy of the Apache License at
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24 #ifndef PXR_IMAGING_HD_ST_COMPUTATION_H
25 #define PXR_IMAGING_HD_ST_COMPUTATION_H
26 
27 #include "pxr/pxr.h"
28 #include "pxr/imaging/hdSt/api.h"
29 
30 #include <memory>
31 #include <vector>
32 
34 
35 
36 class HdResourceRegistry;
37 
38 using HdBufferArrayRangeSharedPtr = std::shared_ptr<class HdBufferArrayRange>;
39 using HdBufferSpecVector = std::vector<struct HdBufferSpec>;
40 
41 using HdStComputationSharedPtr = std::shared_ptr<class HdStComputation>;
42 using HdStComputationSharedPtrVector = std::vector<HdStComputationSharedPtr>;
43 
44 /// \class HdStComputation
45 ///
46 /// An interface class for GPU computation.
47 ///
48 /// GPU computation fills the result into range, which has to be allocated
49 /// using buffer specs determined by GetBufferSpecs, and registered as a pair
50 /// of computation and range.
51 ///
53 {
54 public:
55  HDST_API
56  virtual ~HdStComputation();
57 
58  /// Execute computation.
59  virtual void Execute(
61  HdResourceRegistry *resourceRegistry) = 0;
62 
63  /// Returns the size of its destination buffer (located by range argument
64  /// of Execute()). This function will be called after all HdBufferSources
65  /// have been resolved and commited, so it can use the result of those
66  /// buffer source results.
67  /// Returning 0 means it doesn't need to resize.
68  virtual int GetNumOutputElements() const = 0;
69 
70  /// Add the buffer spec for this computation into given bufferspec vector.
71  /// Caller has to allocate the destination buffer with respect to the
72  /// BufferSpecs, and passes the range when registering the computation.
73  virtual void GetBufferSpecs(HdBufferSpecVector *specs) const = 0;
74 
75  /// This function is needed as HdStComputation shares a templatized
76  /// interface with HdBufferSource.
77  ///
78  /// It is a check to see if the GetBufferSpecs would produce a valid result.
79  bool IsValid() { return true; }
80 };
81 
82 
84 
85 #endif // PXR_IMAGING_HD_ST_COMPUTATION_H
std::vector< HdStComputationSharedPtr > HdStComputationSharedPtrVector
Definition: computation.h:42
GLenum GLint * range
Definition: glcorearb.h:1925
virtual void Execute(HdBufferArrayRangeSharedPtr const &range, HdResourceRegistry *resourceRegistry)=0
Execute computation.
virtual void GetBufferSpecs(HdBufferSpecVector *specs) const =0
virtual int GetNumOutputElements() const =0
std::shared_ptr< class HdStComputation > HdStComputationSharedPtr
Definition: computation.h:41
std::vector< struct HdBufferSpec > HdBufferSpecVector
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1432
#define HDST_API
Definition: api.h:40
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:91
std::shared_ptr< HdBufferArrayRange > HdBufferArrayRangeSharedPtr
Definition: bufferArray.h:44
virtual HDST_API ~HdStComputation()